Building a Bit-Accurate Fused QKV + RoPE Kernel for Qwen 2.5 in Triton

This article details the creation of a bit-accurate Triton kernel for Qwen 2.5, fusing QKV projection, RoPE, and KV cache write into a single GPU launch. It achieves a 4.5-5x speedup over multiple PyTorch operations while maintaining exact output accuracy, with the post explaining its design and benchmarking.